Flame-Retardant Thermoplastic Starch Bio-Composite via Organic Phosphonate
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Solution Overview
Problem
Conventional thermoplastic starch is difficult to use in flame-retardant applications due to its inherent flammability and poor mechanical strength, limiting its use in materials like automobile interiors and electronic products, where high impact resistance and flame-retardant properties are required.
Innovation Solution
A flame-retardant thermoplastic starch material is developed by combining 100 parts of starch with 5 to 75 parts of plasticizer and 5 to 30 parts of organic phosphonate flame-retardant, followed by a roll mill plasticizing process, and then blending with a thermoplastic polymer and impact modifier to create a bio-composite with improved mechanical strength and flame-retardant properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermoplastic starch is used as an eco-friendly material to replace petroleum-based plastics, then environmental friendliness is improved, but flame-retardant properties deteriorate because thermoplastic starch is inherently flammable
Solution Approach 1:
The patent incorporates flame-retardant agents into the thermoplastic starch matrix, converting the harmful flammability into beneficial flame-retardant properties. The flame-retardant agents form a protective char layer during combustion that suppresses flame propagation while maintaining the biodegradable nature of starch, thus resolving the contradiction between environmental friendliness and flame safety
Solution Approach 2:
The patent creates a composite material system combining thermoplastic starch with flame-retardant agents and plasticizers. This composite approach allows the material to simultaneously exhibit the environmental benefits of starch-based materials while gaining flame-retardant properties from the added components, overcoming the inherent flammability limitation
2Reliability
If pure thermoplastic starch is used to improve eco-friendliness, then biodegradability is improved, but mechanical strength deteriorates resulting in limited applications
Solution Approach 1:
The patent formulates a composite system where thermoplastic starch is combined with plasticizers and flame-retardant agents. The plasticizers improve polymer chain mobility and intermolecular interactions, enhancing mechanical strength while maintaining the biodegradable characteristic of starch, thus resolving the contradiction between biodegradability and mechanical performance
3Object-affected harmful factors
If flame-retardant agents are added to thermoplastic starch to improve flame-retardant properties, then flame resistance is improved, but processing difficulty increases due to melt-dripping behavior
Solution Approach 1:
The patent optimizes the chemical structure and concentration of flame-retardant agents to modify the thermal and rheological properties of thermoplastic starch. By carefully selecting flame-retardant agents with appropriate molecular structures and controlling their content within specific ranges, the material achieves flame-retardant properties while maintaining suitable melt flow characteristics for processing, thus resolving the contradiction between flame resistance and ease of manufacture
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The resulting flame-retardant thermoplastic starch-based bio-composite exhibits high workability at high temperatures, good molding ability, and achieves a UL-94V0 flame-retardant rating, making it suitable for applications in automobile interiors and electronic products.
Implementation Method 1
the organic phosphonate flame-retardant has the following formula (I)... achieves a UL-94V0 flame-retardant rating
Implementation Method 2
The hydrogen bonds between starch particles may be broken by adding polyol into the starch. The polyol may be glycerol, sorbitol, or polyethylene oxide (PEO)... the starch develops characteristics of thermoplasticity
Implementation Method 3
performing a roll mill plasticizing process to form a flame-retardant thermoplastic starch
Implementation Method 4
performing a roll mill plasticizing process to form a flame-retardant thermoplastic starch (A)
Implementation Method 5
performing a blending process to (A) 5 to 40 parts by weight of the flame-retardant thermoplastic starch, (B) 60 to 90 parts by weight of thermoplastic polymer, and (C) 3 to 10 parts by weight of impact modifier to form a flame-retardant thermoplastic starch-based bio-composite
Data Source
AI summary
In one embodiment, A flame-retardant thermoplastic starch material, including (A1) 100 parts by weight of starch; (A2) 5 to 75 parts by weight of plasticizer; and (A3) 5 to 30 parts by weight of organic phosphonate flame-retardant, wherein the organic phosphonate flame-retardant has the following formula (I):wherein X is a trivalent aliphatic hydrocarbon radical containing 3 to 12 carbon atoms; R1 and R2 are independently C1 to C8 alkyl; and n is 0 or 1.